CVE-2021-3455: Disconnecting L2CAP channel right after invalid ATT request leads freeze
First published: Tue Oct 19 2021(Updated: )
Disconnecting L2CAP channel right after invalid ATT request leads freeze. Zephyr versions >= 2.4.0, >= 2.5.0 contain Use After Free (CWE-416). For more information, see https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-7g38-3x9v-v7vp
Credit: vulnerabilities@zephyrproject.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Zephyrproject Zephyr | >=2.4.0<2.6.0 |
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Frequently Asked Questions
What is CVE-2021-3455?
CVE-2021-3455 is a vulnerability in Zephyr versions 2.4.0 and above that allows an attacker to cause a denial of service by disconnecting the L2CAP channel after an invalid ATT request.
What is the severity of CVE-2021-3455?
The severity of CVE-2021-3455 is high with a CVSS severity score of 7.5.
What is the CWE for CVE-2021-3455?
The CWE for CVE-2021-3455 is CWE-416 (Use After Free).
Which versions of Zephyr are affected by CVE-2021-3455?
Zephyr versions >= 2.4.0, >= 2.5.0, and <= 2.6.0 are affected by CVE-2021-3455.
How can I fix CVE-2021-3455?
To fix CVE-2021-3455, it is recommended to update Zephyr to a version that includes the available patch or mitigation provided by the vendor.
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